Issue with rocket loader

Hi, we have an issue with our website. Loading speed is low and we have this error:

Uncaught TypeError: Cannot read property ‘setAttribute’ of null
at :5:9
at t.activateScript (rocket-loader.min.js:1)
at rocket-loader.min.js:1
at (rocket-loader.min.js:1)
at rocket-loader.min.js:1
at HTMLScriptElement. (rocket-loader.min.js:1)

Any ideas how to fix this?

Thank you

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